Work Vehicle Steering Ratio Control via Dynamic Flow Curves
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Solution Overview
Problem
Existing steering systems for work vehicles lack the ability to automatically adjust steering ratio in response to vehicle speed, leading to sensitivity issues at higher speeds.
Innovation Solution
A steering system that includes a speed sensor, a steering input device, and a controller unit capable of selecting and transitioning between multiple flow-metering curves to adjust the steering ratio based on vehicle speed, providing a smooth transition through intermediate curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a higher steering ratio is used to increase steering sensitivity, then steering output sensitivity is improved, but steering stability deteriorates at high vehicle speeds
Solution Approach 1:
The steering ratio is made dynamically adjustable based on vehicle speed. The controller automatically selects from multiple flow-metering curves (first, second, third base curves) representing different steering ratios, transitioning between them as speed changes. This dynamic adjustment allows the system to maintain optimal steering sensitivity at low speeds while ensuring stability at high speeds, resolving the contradiction between sensitivity and stability.
Solution Approach 2:
The system changes the steering ratio parameter according to vehicle speed conditions. By selecting different flow-metering curves that represent different steering ratios, the system adapts the steering characteristics to match current operating conditions, thereby achieving both high sensitivity when needed and stability when required.
2Stability of the object's composition
If the steering ratio is automatically adjusted in response to vehicle speed, then steering stability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical steering ratio adjustment mechanisms with an electronic control system. The controller unit, using speed signals from a sensor and pre-programmed flow-metering curves, electronically adjusts the hydraulic flow to achieve different steering ratios. This substitution of electronic control for mechanical adjustment reduces overall system complexity while maintaining the ability to adapt steering characteristics.
3Adaptability or versatility
If multiple flow-metering curves are used to provide different steering ratios, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system uses dynamic curve selection based on vehicle speed thresholds. The controller automatically transitions between the first, second, and third base curves as speed increases or decreases, providing adaptability without requiring manual intervention or complex decision-making logic. This dynamic, rule-based approach enhances adaptability while keeping the control system relatively simple.
Data Source
AI summary
A steering system for a work vehicle adjusts the steering ratio in response to changes in the speed of the work vehicle.